A high-level North Korean government delegation - including Kim Yong Nam, the country's nominal head of state, and Kim Jong Un's younger sister, Kim Yo Jong - has arrived in South Korea to attend the Games' opening ceremony.

Kim Yo Jong is the first member of North Korea's ruling family to visit the South.

The delegation will have lunch with South Korean President Moon Jae-in on Saturday.

Both men reiterated their commitment and co-operation to defuse tensions on the Korean peninsula sparked by North Korea's missile and nuclear programmes.

Mr Pence has met North Korean defectors and is expected to pay tribute to a memorial for 46 South Korean sailors killed in 2010 in the sinking of a warship that Seoul blamed on a North Korean torpedo attack.